Hi all - I have a 2011 Limited with 20" wheels. OEM tires are Firestone Firehawks with about 32,000 miles on them. I've rotated them three times, however, these tire seem to get noisy at highway speeds, often above 70 mph. They sound like the kind of noise you can make blowing over the top of a bottle. It's more pronounce on concrete pavement, but I can also hear it on asphalt. Seems a little early for wheel bearings to go bad. I'm think it must be the tires...Any insight ?